while searching on internet you should open only that files or links with which you are sure. don't open unknown links or e mails as they can be spams or can virus in them which can damage your computer.

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Now a days children under the age of maturity are becoming mischievous due to internet... if no care is taken by parents children get addicted to internet due to its vast no. of uses and harms... so there are even some internet broadbands that provide full access for parents about what their children are using internet for... so i suggest such type of precautions...